Percolator.



S. A. WILTSIE.

PEROOLATOR; API'LIGATION FILED JAN.22, 1912.

Patented Mar. 16, 1,915.

' 514m Wcoz Win woman THE NORRIS PETERS CO., PHOTG-LITHO- WASHING roN, D, Cv

unrnn STATES FATE J OFFICE.

SPENCER A. WILTSIE, OF ERIE, PENNSYLVANIA, ASSIGNOR TO THE GRISWOLD MANU- FACTURING COMPANY, OF ERIE, PENNSYLVANIA, A CORPORATION OF PENNSYL- VANIA.

PERGOLA'IOR.

Application filed January 22, 1912.

To all whom it may concern:

Be it known that I, SPENCER A. VVIL'rsrE, a citizen of the United States, residing at Erie, in the county of Erie and State of Pennsylvania, have invented new and useful Improvements in Percolators, of which the following is a specification.

This invention relates to percolators and consists in certain improvements in the con struction thereof as will be hereinafter fully described and pointed out in the claims.

More particularly the invention relates to that type of percolators designed for domestic use.

The object of the invention is to provide a percolator of this type of simple construction and capable of efficient operation.

The invention is illustrated in the accom panying drawings as follows Figure 1 shows a central section through the percolator. Fig. 2 a side elevation of the capillary passage forming plate and tube support. Fig. 3 a bottom view of said plate.

1 marks the storage chamber of the receptacle. This is supported by a base 2, the receptacle being connected to the base by the neck 3. The heating chamber 4: is arranged in the neck 3. The tube 5 is carried by the part 6. The part 6 has the projections 6 which hold it out of contact with the walls of the storage and heating chambers leaving the extended capillary passage 7 between the part 6 and said walls. The downwardly projecting portion of the part 6 extends into the heating chamber and the end of the passage leading to the tube 5 is flared at 8 so that the opening of the tube extends over substantially the entire area of the heating chamber 4.

The material holding pocket 9 extends through the opening 10 in the top of the receptacle, the pocket having the curled edge 11. The strainer 12 has a central tubular projection 13 adapting it to be hung on the top of the tube 5. A cover 14 rests on the strainer 12 and the glass cap 15 is arranged on the cover so that the operation of the percolator may be observed.

Specification of Letters Patent.

. Patented Mar. 16, 1915. Serial No. 672,534.

In operating the percolator, the storage chamber is filled about two-thirds full although any particular height is not compulsory and in the operation of the percolator the liquid passes down through the passage 7 to the heating chamber and up the tube 5. When the liquid in the heating chamber re ma ns stationary any length of time, some of it is converted into steam and this steam operating on the liquid in the tube 5 forces it out of the top of the tube, the passage 7 being extended and of capillary dimensions offers suflicient resistance by reason of capillary action as the dominant factor in the resistance to a return movement of liquid through it, so that this pumping action through the flash in the chamber 1 is accomplished without the use of valves or other moving parts. I have found in practice that a passage of about twenty-thousandths of an inch cross dimension gives very satisfactory results. The devices at the top operate in the manner common to similar devices in percolators of this type.

It will be noted that the part 6 can be readily removed by drawing it through the top, the tube 5 being secured to the part, and the other parts can also be readily removed, so that all parts of the percolator can be readily cleaned. The separation of the walls of the passage 7 is particularly important for this purpose. It will also be noted that the storage chamber, capillary passage, heating chamber and tube are in a series, that is to say, the liquid passes from the storage chamber through the capillary passage through, the heating chamber and thence to the tube.

I have found that by making the walls of the chambers 1 and 4 of substantial thickness, the thickness ordinarily used in cast utensils, that it is possible to heat the heat ing chamber to a temperature producing the flash and to diffuse this heat through these comparatively thick walls so that the liquid in the receptacle 1 is not raised at any local point to a temperature above what might be termed the critical temperature that would precipitate the caffein from the solution where coffee is being made. This is a very important result and obviates the numerous expedients heretofore used as for instance, insulating material in the neck 3.

WVhat I claim as new is 1. In a percolator, the combination of a receptacle having a storage chamber for the body of the liquid; a heating chamber below the storage chamber and walls forming an extended capillary passage leading from the storage chamber to the' heating chamber, said passage offering resistance and the capillary action in said passage being the dominant factor in said resistance to the backflow of liquid from'the heating chamber to the storage chamber as steam is formed in the heating chamber; and a tube leading from the heating chamber to a point in the upper part of the storage chamber, the storage chamber, capillary passage, heating chamber and tube being in series.

2. In a percolator the combination of a receptacle having a storage chamber for the body of the liquid; a heating chamber below the storage chamber and having walls forming an extended capillary passage connecting the storage chamber with the heating chamber, the walls of thereceptacle forming a part of the walls of sald passage, said passage offering resistance and the cap illary action in said passage being the dominant factor in said resistance to the backflow of liquid from the heating chamber to the storage chamber as steam is formed in the heating chamber; and a tube leading from the heating chamber to a point in the upper part of the storage chamber, the storage chamber, capillary passage, heating chamber and tube being in series.

5. In a percolator, the combination of a receptacle having a storage chamber for the body of the liquid; a heating chamber below the storage chamber; a part arranged in the bottom of the receptacle and distanced from the walls of the receptacle forming in conjunction with said walls of the receptacle an extended capillary passage converging downwardly from the storage chamber to the heating chamber connecting the storage chamber and the heating chamber, said passage offering resistance and the capillary action in said passage being the dominant factor in said resistance to the back flow of liquid from the heating chamber to the storage chamber as steam is formed in the heating chamber; and a tube extending from the heating chamber through the part to a point in the upper part of the storage chamber, the storage chamber, capillary passage, heating chamber and tube being in series.

4. In a percolator, the combination of a receptacle having a storage chamber for the body of the liquid; a heating chamber below the storage chamber; a part arranged in the storage chamber and forming a cover for the heating chamber, said part having an opening flared toward the bottom of the heating chamber, said part extending along the walls of the receptacle and spaced from said walls fo rming between the part and the walls of the receptacle an extended capillary passage connecting the storage chamber and the heating chamber, said pass sage offering resistance and the capillary action in said passage being the dominant factor in said resistance to thebackflow of liquid from the heating chamber to the storage chamber as steam is formed in the heating chamber; and a tube extending from the opening in said part to the upper part of the storage chamber, the storage chamber, capillary passage, heating chamber and tube being in series;

5. In a percolator, the combination of a receptacle having a storage chamber and a heating chamber; a removable part distanced from the walls of the receptacle forming with the Walls of the receptacle an extended capillary passage, said passage offering resistance and the capillary action in said passage being the-dominant factor in said resistance to they backfiow of liquid from the heating chamber to the storage chamber as steam is formed in the heating chamber, connecting the storage chamber with the heating chamber; and a tube extending from the heating chamber to apoint in the upper part of the storage chamber, the storage chamber, capillary passage, heating chamber and tube being in series.

6. In a percolator, the combination of a receptacle having a storage chamber for the body of the liquid; a heating chamber extending downwardly from the storage cham" her; a part resting in the bottom of the receptacle and forming a cover for the heating chamber, forming with the walls of the receptacle an extended capillary passage converging from the storage chamber to the heating chamber, said passage offering resistance and the capillary action in said passage being the dominant factor in said resistance to the backflow of liquid from the heating chamber to the storage chamber as steam is formed in the heating chamber, connecting said chambers, said part being removable; and a tube secured to said part and extending upwardly therefrom forming an upwardly extending passage from the heating chamber to the upper part of the storage chamber, the storage chamber, capillary passage, heating chamber and tube being in series.

7. In a percolator, the combination of a receptacle having a storage chamber and a heating chamber'the Walls thereof formingwith the walls of the receptacle an extended capillary passage between the storage chamber and the heating chamber, saidpassage offering resistance and the capillary action in said passage being the dominant factor in said resistance to the backflow of liquid from the heating chamber to the storage chamber as steam is formed in the heating chamber, the outer walls of the heating chamber and receptacle along the capillary passage being of greater thickness than the cross sectional dimension of the capillary passage for difi'using the heat of the heating chamber along the walls of the receptacle; and a tube extending upwardly from the storage chamber to a point in the upper part of the storage chamber, the storage chamber, capillary passage, heating chamber and tube being in series.

8. In a percolator, the combination of a receptacle having a heating chamber formed in the bottom thereof and having its walls flaring outwardly and upwardly from the heating chamber; a part resting on the bottom of the receptacle and forming a cover for the heating chamber separating the receptacle into a heating chamber and a storage chamber, said part extending from the cover along the walls of the receptacle and forming in conjunction with the walls of the receptacle an extended capillary passage converging downwardly from the storage chamber to the heating chamber and ofi'ering resistance and the capillary action in said passage being the dominant factor in said resistance to the backfiow of liquid from the heating chamber to the storage chamber as steam is formed in the heating chamber; and a tube extending from the cover to the upper part of the receptacle, the storage chamber, capillary passage, heating chamber and tube being in series.

9. In a percolator, the combination of a receptacle having a storage chamber for the body of the liquid; a heating chamber below the storage chamber; a part arranged in the bottom of the receptacle and distanced from the walls of the receptacle forming in conjunction with said walls of the receptacle a narrow passage converging downwardly from the storage chamber to the heating chamber connecting the storage chamber and the heating chamber, said passage offering resistance as steam is formed in the heating chamber; and a tube extending from the heating chamber through the part to a point in the upper part of the storage chamber, the storage chamber, passage, heating chamber and tube being in series.

10. In a percolator, the combination of a receptacle having a storage chamber for the body of the liquid; a heating chamber below the storage chamber; a part arranged in the storage chaiiiber aha forming a cover for the heating chamber, said part having an opening flared toward the bottom of the heating chamber, said part extending along the walls of the receptacle and spaced from said walls forming between the part and the walls of the receptacle a narrow passage connecting the storage chamber and the heating chamber, said passage oilerin'g resistance to the backflo'w of liquid from the heating chamber to the storage chamber as steam is formed in the heating chamber; and a tube extending from the opening in said part to the upper part of the storage chamber, the storage chamber, passage, heating chamber and tube being in series.

11. In a percolator, the combination of a receptacle having a storage chamber for the body of the liquid; a heating chamber extending downwardly from the storage chainber; a part resting in the bottom of the receptacle and forming a cover for the heating chamber, forming with the walls of the receptacle a narrow passage converging from the storage chamber to the heating chamber, said passage ofiering resistance to the backfiow of liquid from the heating chamber to the storage chamber as steam is formed in the heating chamber, connecting said chambers, said part being removable; and a tube secured to said part and extending upwardly therefrom forming an upwardly extending passage from the heating chamber to the upper part of the storage chamber, the storage chamber, passage, heating chamber and tube being in series.

12. In a percolator, the combination of a receptacle having a storage chamber and a heating chamber the walls thereof forming with the walls of the receptacle a narrow passage between the storage chamber and the heating chamber, said passage ofi'ering resistance to the backfiow of liquid from the heating chamber to the storage chamber as steam is formed in the heating chamber, the outer walls of the heating chamber and re ceptacle along the passage being of greater thickness than the cross sectional dimension of the passage for diffusing the heat of the heating chamber along the walls of the receptacle; and a tube extending upwardly from the storage chamber to a point in the upper part of the storage chamber, the storage chamber, passage, heating chamber and tube being in series.

13. I11 a percolator, the combination of a receptacle having a heating chamber formed in the bottom thereof and having its walls flaring outwardly and upwardly from the heating chamber; a part resting on the bottom of the receptacle and forming a cover for the heating chamber separating the receptacle into a heating chamber and a storage chamber, said part extending from the cover along the walls of the receptacle andforming in conjunction with the walls of the receptacle a narrow passage converging downwardly from the storage chamber to the heatin chamber and ofiering resistance to the baciiflow of liquid from the heating chamber to the storage'chamber as steam is formed in the heating chamber; and a tube extending from the cover to the upper part witnesses.

SPENCER A. WILTSIE. Witnesses THOMAS C. MILLER, B. M. HARTMAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0.. 

